feat(sublime pkgs): use local cache of pkgs

- Sublime Package Control can run rampant with
    memory usage when installing 50+ new packages
    all at once, so prime it with a local cache instead
    of expecting everything to install on first startup
 - This also prevents all sorts of Sublime error dialogs
    as package setings are present, but packages may
    not exist yet

EthanBrown.SublimeText2.UtilPackages/tools/chocolateyInstall.ps1

@@ -30,6 +30,8 @@ try {
   ([IO.File]::ReadAllText($sublimeFiles)) -replace '{{term_command}}', $escapedPs |
     Out-File -FilePath (Join-Path $sublimeUserDataPath $sublimeFilesFileName) -Force -Encoding ASCII
 
+  $packageCache = Join-Path (Get-CurrentDirectory) 'PackageCache'
+  Install-SublimePackagesFromCache -Directory $packageCache
   Install-SublimePackageControl
   $packageControl = (Join-Path (Get-CurrentDirectory) 'Package Control.sublime-settings')
   Merge-PackageControlSettings -FilePath $packageControl